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Old 01-27-2018, 02:08 PM   #1
dennislbrooks
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Join Date: Feb 2004
Location: Williamsburg, Ohio
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4 speed crash box - bearings

This may be listed elsewhere and maybe no one cares but I disassembled a GM 1946 -- 4 speed crash box and have the following bearing list:


Input shaft to mainshaft pilot -- Open Roller cage - no number found - have not found- .875" ID x 1.25" ODx 1.5 " long ---- I need to clean up the mainshaft pilot so I will lathe it to .75" and hope to use a Koyo HJ-122016 open needle roller bearing. It has an outer case that may solve any female input shaft issues. .75"x1.25"x1" long

Input shaft bearing -- FAFNIR 209K

Rear Mainshaft --- New Departure 3307

Front Countershaft --- Hyatt ORB 1206

Rear Countershaft ---- Hyatt ORB 1207


Feel free to update or correct this list and add any cross references, etc.
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1942 Chevy 1/2 ton Rod, 1946 Chevy 3/4 ton, 1959 GMC 1/2 ton Fleet Stepside, 1967 Chevy SWB K10, 1970 Olds 442, 1985 Corvette Coupe 4+3, 2006 Chevy 4WD W/T, 2015 Chevy Duramax reg cab 4WD W/T

Last edited by dennislbrooks; 01-28-2018 at 09:42 AM. Reason: words
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Old 01-28-2018, 09:38 AM   #2
dennislbrooks
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Re: 4 speed crash box - bearings

The fit of the Koyo is just a bit more than a slip fit into the input shaft... nice. Should be able to pull it easily with a pilot bushing puller. Again I will lathe the mainshaft pilot to .75 inch.

There are probably some of the originals nos open roller cage bearing out there.

Has anyone removed the rear main shaft bearing -- new departure 3307--- with a bearing seperator and not destroyed it? Or does the inside snap ring on the shaft push the bearing off?
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1942 Chevy 1/2 ton Rod, 1946 Chevy 3/4 ton, 1959 GMC 1/2 ton Fleet Stepside, 1967 Chevy SWB K10, 1970 Olds 442, 1985 Corvette Coupe 4+3, 2006 Chevy 4WD W/T, 2015 Chevy Duramax reg cab 4WD W/T

Last edited by dennislbrooks; 01-29-2018 at 09:08 AM. Reason: words
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